Draft regulator for boiler furnaces



July 14. 1925.

1,545,969 E. NORDEN DRAFT REGULATOR FOR SOILER FURNACES Filed April ll, 192?. 2 Sheets-Sheet. l

July 14, 1925.

` E. NORDEN DRAFT REGULATOR FCR SOIL ER FURNACES Filed April ll, 1922 2 Sheets-Sheet 2 Patented July 14, 1925.

UNITED STATES EMIL NORDEN, OF CHICAGO, ILLINOIS.

DRAFT REGULATOR FOR BOILER FURACES.

Application led April 11, 1922. Serial No. 551,669.

To all 'whom it may concern.' i Be it known that I, EMIL Nonnen, a c1t1- zen'of the United States, and a resldent of the city of Chicago, county of Cook, and

State of Illinois, have invented certain new and useful Improvements in Draft Regulators for Boiler'Furnaces; and I do hereby declare the following to be a full, clear, and exact description thereof.

This invention relates to draft regulators for boiler furnaces, and has for its object the provision of means auto-matically oper able by the ressure regulator of said fur nace to regu ate the draft therethrough.

Another ob'ect'of the invention is to provide means or delaying the operation of the draft operating mechanism until the pressure, and consequently the pressure regulator, have reached a certain point before the draft operating mechanism is actuated.

Still another object is to provide means whereby the comparatively small movement of the pressure regulator is multiplied to impart to the draft operating mechanism a much greater movement.

AStill another object of the invention is to. balance the draft operating mechanisn'i whereby only a comparatively small force is necessary to operate same.

Other objects willappear hereinafter.

The invention consists in the combina` tions and arrangements of parts hereinafter` described and claimed.

The -invention will be best understood by reference to the accompanying drawings forming a part of this specification, and in which,

Fig. A1, is a fragmentary side elevational view of a boilerfurnace showing the invention applied thereto. Y

Fig. 2, is a detail view of means actuated by the pressure regulatoi` of the boiler to impart an operative stroke to the draft operatin mechanism.

-F1g. 3, is a view partly in section on the line 3 3, Fig. 2. v Y

Fig. 4, is a view of a modified form of the apparatus for transmitting 'movement of the pressure regulator to the draft operating mechanism, and

Fig.'5, is a detail view of the damper used in connection with the invention.

- Y The invention comprises a furnace of any desirable type having a body portion 10, containing the boiler and means for heating same, such furnace being provided with a door 11 leadin into the fire box, a draft door 12, and a ue or chimney 13, for the escape of products of combustlon. A pressure diaphragm 14 or othersuitable `pressure regulator of an ordinary type may be mounted in the usua manner on the furnace, such regulator in this instance being provided with'- a lever 15 pivoted at 16 to the movable element 17 of the regulator14, and also pivoted at 18 on a bracket mounted on the casing of such regulator. The lever 15 i is also usually provided with an adjustable weight 19 to regulate the movement of said lever. The construction of the furnace so far described is well known and no claim is made herein to such construction except in conjunction with the apparatus hereinafter described.

In carrying out my invention, I provide means for multiplying a comparatively small movement of the lever 15 of the' pressure regulator 14 so as to impart a greater movement to draft operating mechanism situated at some distance from said lever.

This may be accomplishedin many different ways of which I disclose several herein. The preferred construction consists of suitable spaced brackets 20 and 21, which may be mounted on any suitable support, in this particular instance being secured to the ceiling 21l above the boiler furnace. Preferably pivotally mounted at the end of each of the brackets 20 is a bell-crank lever 22, one of the legs of which is preferably twice as long as its other leg, the shorter leg in this instance projecting on the outer side of its related bracket. Preferably pivotally connected to the end of each of the brackets 21 is a bell-crank lever 22' similar in all respects to the levers 22, excepting that same is inverted, thus providing alternating upright and inverted bell crank levers. The adjacent ends of such levers are preferably connected together by suitable flexible elements 23, as shown. By this arrangement,

it is apparent that small movement com- A municated to the short leg of the outermost bell-crank lever will impart a much greater movement to the long leg of the innermost bell-crank lever.

Pivotally secured to the short leg of the,

to prevent pl'aly herebetween. The bracket 25 is 'xiliec'ted to the dra'ft"regulatingr lever 15 by means of a bar 26 pivotally connected to the lever 15, and having :its inner `end projecting through the slot in the bracket 25, in the normal position of @the leve'r s15 being held thereby at the upper end of said slot, the object in havingthe "lever 26 Anoi-- mally resting in the upper end of the slot in the bracket b'eing ttor the Apurpose of permittingfconsderable movement of the le'ver 15 befoe imparting dpei'ative tmove nient tto jthtadiift -inedhanism, in contradigtin'dtionnlt'o vthe type of lcli-aft regulating n'ens which operates immediately Lthe Vlever 15 lbe'igi'n's to"mve'toielose thed'raift mech- 'anisnL Such bar is preferablyprovided 'with `a "fdiiked guide merlibe'r '27 adapted to 'el'fgfzageitlieend of the Ylever 15 ass'liown, 'to 'p'reve'nt lateialfmvement of `said :bar with rpet, te vsaid :levee A number of 'sitab'le 'Weights' 28 'are 'preferably vmounted upon A't'lre" b'ar) 26, one on ea'ch "sitle of 'the 1lnrac'ke'ta ssliovvn. The bte'tl in pivotally 'iniritxi'fftliebr 26 and providing Ysame with wveights`28 'is Afor the purpose 'of pre venting .injury to the draft regulator'inthe revent Itliat 'the `ne'cha'iiis'm 'for transmitting mgvmm to the ai-afa medians-m sumar-i `fail to'opera'te for any reason, it b'eingiil'p- ,parent 'that then the rbar 26 reaches the Jbt'tr'n VVAof the slot 'in .'the bracket 25, 'and fthe rs'istane littered 'by said .bracket is 'reater'than v the-frce exe'rted'by't'lie'weights entiuefmovmet of the lever- '15 downwardly Iv'vi'll 'cause t'liebar`26'to swing onits j pivt'ivithoutA exerting injurious strain en fthetappaatiis.

Mounted lin 'the elii'rnne 13 isa suitable -ldaniper y29, "wvlii'c'h "is preferably lnormally ,'he'ld in inoperative @position by means of a veighted 'arm 30, and a connection is 'iliade vv{vit'h the Aendfof the innermost bell-crank lever 22 and the arm 30, movement of said eonnetion through said bell-crank leve-r serving, o swing the damper-29 to closed'. position n ithe (present. instance, l preferablymloult sueh a damper29 in a housing 1, andfI -pivitally mount an auxiliary Aamper B2 on vthe-damper29, and preferablyjprovide adjustable means for varying 'the distance between the'dampers y29 and .Such adjustable means 'may consist of 32. la 'finger''lpivotallymunted on the damper 29 and exten'din Athroiiggh a slet in the Adaxipler 32, sulNi-inger being"threaded, Sand 'there'being lck nuts 34 provided "as slioivn, 't'rnin'g'of vsaid mitsfbeingzadapted to slide the damper 32 on the finger33 and s'o'vary 'the-distance betiveen 4the dampers. 'By this arrangement, it Awill be seen'that though the damper'29 may be turned into the chimney 13`tfo cut off the'draft therethrough, so long ,as the auxiliary 4damper 32 remains inthe housing 31 cold air will be excluded :from

the fdhimney, lthus avoidifg ullen and unaverrabi@ @001mg 'of um ferme rPhe draft door 12 is connected to the -weightgeflgarm 30, by a flexible connection 34, and of course movement of the arm 30 is transmitted 'through such connection to the draft door 12.

'In Fig. 'llisldhovvn a modification of the linvention, which is similar in all respects to that above desdribelexcept for thelne'ans for multiplying the movement df ithe )lever 15, and '-'the'fmeans 'ffo'r eonneetingsuch lever ceiling '21 above ithe "fti-ltiaee, llhl A"to the end of said ibra'e'kets pivoteda lev'fer'having "a 'short end B6 land '-a 'long end-137, 'the end 37 of the lever jbeing eonnect'edto 'the 'arm 330 -above described. VThe "lnger end 37 the level- -is iprefeiauiy balanced by weight 38 iwhi'ch holds "the -leve'r inthepsitio'n s'how'n in fulllines in Fi'g. *4, Whi'eh is s] i gli'tly lbeneath the noina'l position of 'the lever 15. The Vlever l15 -in this 'instance is preferably `provided with a fforli'edfguide 539 at its end fivhieh "is disposed -bot`fthe 93nd S'Gf s'ziidleve'r. Retainingthe l'leverSome Aivhat below the normalposition dtfltheflver `1'5 accomp'lisilies-theA same purpose astlielot an d v lever connection ja'bove described, n'name ily, that "the I'lever 151s ifi-ee to Jm'ovelia jpredetermined distance lbefore limp"a'rtng ian 4opera'tive 'stro'ke to the 'entl'l of the lever.

It will be seen tha'tmofvemeit tot'helever 15 'to la "c'ertain point A"actuates A'inultplying mechanism xvhih communicates 'a ,greater movementto "tl1e damper, which lin turn communicates movement to the draft 'door'.

Vli'ie AI lrav'e illustrated and described' the preferred t*fomJocon'struction for carrying my in've'ntiori linto Lpeifl'eet, this is eapable 0f variation antl'modlication lW'itheut departing from "the spirit 1of the invention. therefore, dont wish I'to ibe limited to the 'precise details "of vconstruction set iforth, but desire to avail myself of such *varia tions and modificatinsa'sfcme Within the Ascope o't the appended claims.

Having described my "invention, 4What I claim Jasireiv and desireto secure by'L-'etters Patent "is Y fl. The combnation of a Ifurnace having a movable regulator; draftinedlanismhav- 'ing'means for"acmating same; andabracket l connected to said actuating meanslandlraving a slot'A therein, adapted:4 to receive fia part 'of s'a'id regulator ltherein which in normal 'position lrests in theupper end "of'said sl't, and the movement of Lsaid regulator part being transnttedonlyto-saidibraeket When it ieaches'tlie lower end Y'olfs'aidiisll'ot.

2. The cdmbinatinfdf a frn-ace lafving a movable regulatorgdraft mechanism 'fla'ving means Lfor Vact"uat'Y-i'n'g sati'e; 'means `V-for `normally imparting 'an e'pert-ve 1strokeol said regulator to said actuating means; and slot and lever means arranged to provide slack play when said actuating means offers greater than normal resistance to the movement of said regulator.

3. The combination of a furnace having a movable regulator; draft mechanism having means for actuating same; a lever pivotally connected to said regulator and connected to said actuating means; and Weights on said lever adapted to overcome the normal resistance of said actuating means to operate same, but permitting said lever to swing on its` pivotl when said actuating means olfers greater than said normal resistance.

4. The combination of a furnace having a movable regulator; draft mechanism; multiplying mechanism consisting of a series of pivoted alternate upright and inverted bell cranks having legs of different lengths connected together; and a heavy bracket pivotally connected to the outer of said bell cranks and connected to said regulator adapted to balance said draft mechanism so that a comparatively light stroke from said regulator will operate same.

5. The combination of a furnace having a movable regulator; draft mechanism; multiplying mechanism consisting of a series of pivoted alternate upright and inverted bell cranks having legs of different lengths connected together; and a brackethaving a slot therein adapted to receive a part of said regulator; Which in normal position rests in the upper end of said slot, and the movement of said regulator part being not transmitted to said bracket until it reaches the end of said slot.

6. The combination of a furnace having a movable regulator; draft mechanism; multiplying mechanism consisting of a series .of pivoted alternate upright and inverted bell cranks having legs of different lengths connected together; a lever pivot-ally connected to said regulator and connected to said multiplying means; and Weights on said lever adapted to overcome the normal resistance of said multiplying means to operate same, but permitting said lever to swing on its pivot when said multiplying means oers greater than said normal resistance.

7 The combination of a furnace having a movable regulator, and a iue at a distance therefrom; a housing communicating with said flue; radially disposed dampers pivotally mounted in said housing adapted to partially close said flue, at the same time excluding cold air therefrom; and multiplying means connecting said regulator and said dampers, said multiplying means consisting of a series of pivoted alternate upright and inverted bell cranks having legs of different lengths connected together.

8. The combination of a furnace having a movable regulator; and a flue at a distance therefrom; a housing communicating with said Hue; and radially disposed dampers pivotally mounted in said housing adapted to partially close said flue, at the same time excluding cold air therefrom; multiplying mechanism operatively connected to said dampers; and consisting of a series of pivoted alternate upright and inverted bell cranks having legs of different lengths con` nected together; and a bracket connected to said multiplying mechanism, having a slot therein adapted to receive a. part of said regulator therein, which in normal position rests in the upper end of said slot, and the movement of said regulator part being not transmitted to sa-id bracket until it reaches the end of said slot.

In testimony whereof I have signed my name to this specification in the presence of tWo subscribing Witnesses.

EMIL NORDEN.

Witnesses:

CLARENCE E. THREEDY;

JOSHUA R. H. Po'rrs. 

